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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceae81d7c8b9a0059d283e542bb42fe0bc2f5e338ad3853890df934bde6883ac' 
  AND token = 'TSiSK3mzzsj6+AXuRzobExeZTnYQ5Qz9fJbSy5aFXjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}